dpdk: cleanup MTU handling

Type: improvement
Change-Id: I4b929693f3671be8ee63a58afcbac75a27d99d57
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 22 insertions, 1 deletions

diff --git a/src/plugins/dpdk/device/common.c b/src/plugins/dpdk/device/common.c
index f77e377e14c..c32382a55c6 100644
--- a/src/plugins/dpdk/device/common.c
+++ b/src/plugins/dpdk/device/common.c
@@ -48,6 +48,7 @@ dpdk_device_setup (dpdk_device_t * xd)
   vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, xd->hw_if_index);
   struct rte_eth_dev_info dev_info;
   u64 bitmap;
+  u16 mtu;
   int rv;
   int j;
 
@@ -89,6 +90,12 @@ dpdk_device_setup (dpdk_device_t * xd)
       xd->port_conf.rxmode.offloads ^= bitmap;
     }
 
+  if (xd->port_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME)
+    xd->port_conf.rxmode.max_rx_pkt_len =
+      clib_min (ETHERNET_MAX_PACKET_BYTES, dev_info.max_rx_pktlen);
+  else
+    xd->port_conf.rxmode.max_rx_pkt_len = 0;
+
   rv = rte_eth_dev_configure (xd->port_id, xd->conf.n_rx_queues,
 			      xd->conf.n_tx_queues, &xd->port_conf);
 
@@ -98,6 +105,21 @@ dpdk_device_setup (dpdk_device_t * xd)
       goto error;
     }
 
+  rte_eth_dev_get_mtu (xd->port_id, &mtu);
+  dpdk_log_debug ("[%u] device default mtu %u", xd->port_id, mtu);
+
+  hi->max_supported_packet_bytes = mtu;
+  if (hi->max_packet_bytes > mtu)
+    {
+      vnet_hw_interface_set_mtu (vnm, xd->hw_if_index, mtu);
+    }
+  else
+    {
+      rte_eth_dev_set_mtu (xd->port_id, hi->max_packet_bytes);
+      dpdk_log_debug ("[%u] port mtu set to %u", xd->port_id,
+		      hi->max_packet_bytes);
+    }
+
   vec_validate_aligned (xd->tx_queues, xd->conf.n_tx_queues - 1,
 			CLIB_CACHE_LINE_BYTES);
   for (j = 0; j < xd->conf.n_tx_queues; j++)
@@ -144,7 +166,6 @@ dpdk_device_setup (dpdk_device_t * xd)
   if (vec_len (xd->errors))
     goto error;
 
-  rte_eth_dev_set_mtu (xd->port_id, hi->max_packet_bytes);
   xd->buffer_flags =
     (VLIB_BUFFER_TOTAL_LENGTH_VALID | VLIB_BUFFER_EXT_HDR_VALID);